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Published in:
25-04-2022
Dielectric relaxation behaviour and ionic conductivity for corn starch and PVP with sodium fluoride
Published in: Journal of Materials Science: Materials in Electronics | Issue 16/2022
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Abstract
Biopolymer electrolytes based on cornstarch and polyvinyl pyrrolidone blend with different weight per cent of sodium fluoride salt were synthesized using solution casting technique. The amorphous nature of the polymer blend with the addition of NaF had been studied by X-ray diffraction studies. Fourier Transform Infrared studies helped to discover the presence of functional groups and the complex formation between the bonding of polymers chains. Using AC impedance analyzer, the dielectric behaviour was recorded in the frequency (1 Hz–1 MHz) and various ranges of temperature (303–373 K). The ionic conductivity was improved with the increase of salt concentration as well as temperature. The maximum conductivity of 4.6629 × 10–4 S cm−1 was obtained for 15 wt% of sodium fluoride-added electrolyte. The temperature dependence of conductivity for polymer electrolyte films has followed the Arrhenius relation and minimum activation energy of 0.1775 eV was noted for the sodium fluoride-added sample. Relaxation time (τ) was identified from the tangent loss peak observed at 303 K. Wagner’s DC polarization technique confirmed that the conductivity was due to the ions. The modulus spectra indicated the Non-Debye nature of the electrolytes. Argond plot investigated the relaxation process. Electrochemical stability was confirmed by Cyclic voltammetry.